Auth0

API

Hosted login, user management and authorization for apps, APIs and AI agents

Price: Free tier, then paid
Access: Management API access token

About

Okta's hosted identity platform with Universal Login, social and enterprise connections, MFA, organizations and machine-to-machine tokens. Free up to 25,000 monthly active users; paid plans are priced per MAU and cost more for B2B than for B2C apps.

What you can do with it

Add hosted login with social, passwordless and enterprise connections to your app
Protect your APIs with access tokens, roles and machine-to-machine credentials
Let AI agents call third-party APIs on a user's behalf with Token Vault

Get started

Create a tenant and a machine-to-machine app in the Auth0 Dashboard
Authorize the app for the Auth0 Management API
Copy the tenant domain, client ID and client secret

Example

# Get a Management API token, then list the applications in your tenant
curl --request POST \
  --url "https://$AUTH0_DOMAIN/oauth/token" \
  --header 'content-type: application/x-www-form-urlencoded' \
  --data grant_type=client_credentials \
  --data "client_id=$AUTH0_CLIENT_ID" \
  --data "client_secret=$AUTH0_CLIENT_SECRET" \
  --data "audience=https://$AUTH0_DOMAIN/api/v2/"

curl "https://$AUTH0_DOMAIN/api/v2/clients" \
  --header "authorization: Bearer $AUTH0_MGMT_TOKEN"

Details

Hosting: Hosted service
Available in: Worldwide
Official SDKs: JavaScript/TypeScript, Python, Go, Java, PHP, Ruby, C#, Swift, Kotlin, Dart
MCP server: Local